Solar Companies in Fullerton, CA: Who Installed the Most Systems in 2025

Installers who connected the most home solar systems in Fullerton in 2025

Counts from utility records, not a ranking or endorsement. Check each license's status and complaint history on the CSLB's Check a License page (checked Sept. 24, 2026).

Source: California Distributed Generation Statistics (CPUC), Interconnected Project Sites data set, data through May 31, 2026 (checked Sept. 24, 2026).

Home solar in Fullerton by the numbers

SCE approved 319 home solar systems in Fullerton in 2025, from 82 installers; the top three were named on 40% of them. The busiest year since 2021 was 2023, with 850 (2025: -62%). Another 199 were approved from January through May 2026.

2025 mix: 48% leased or on a power purchase agreement, 52% owned by the household; 91% with a battery; median size 7.7 kW DC. Orange County: 40% leased or PPA, 65% with a battery, median 6.75 kW.

Hiring a solar company in Fullerton

Solar companies in Fullerton connect to SCE, but the generation comes from the Orange County Power Authority, which pays 10% more than SCE for excess solar, trues up every April and currently treats its Net Billing Tariff customers as if they were on NEM 2.0. The City permits eligible systems through SolarAPP+ and posts a quarterly solar permit dashboard. Compare at least three written bids built on your own OCPA and SCE bill.

Start with your Fullerton electricity bill

Fullerton is one of the Orange County Power Authority's member cities, with Buena Park and Irvine, and the Energy Commission's maps show SCE delivery and OCPA generation across nearly all of it. SCE delivers the power and sends the bill; OCPA handles the generation charges and credits. That split changes the value of a Fullerton system, so every bidder should model OCPA's solar terms rather than SCE's alone.

How OCPA credits a Fullerton solar home

The Orange County Power Authority launched in 2022, and its current member cities are Buena Park, Fullerton and Irvine, with Fountain Valley beginning service soon. In a member city, customers are enrolled automatically and can opt out to SCE generation. For solar customers, SCE remains responsible for delivery charges and credits and for the bill, while OCPA handles the generation charges and credits.

OCPA's terms differ from SCE's in four ways it spells out: it pays 10% more for excess generation, reconciles generation charges monthly, trues up every April so credits banked in spring and summer can be used before they convert to Net Surplus Compensation, and currently treats solar customers on the Net Billing Tariff as if their generation were under NEM 2.0. The word currently matters; ask each bidder how its savings would change if OCPA moved to the standard tariff.

Fullerton's permits and solar dashboard

Fullerton reported SolarAPP+ to the Energy Commission as its automated permit platform, and the SolarAPP+ program lists the City as accepting solar with storage, main panel upgrades and main breaker derates. The City's 2023 report counted 895 residential solar permits, about 12% with battery storage and about 6% issued online.

The City also runs a Solar Permit Dashboard, updated quarterly, that maps solar installations and separates regular residential photovoltaic permits from SolarAPP+ and commercial permits, to show how many automated permits are being completed. It is a quick way to see whether solar is common on your street before you start collecting bids. A small edge of the city maps to Anaheim Public Utilities, so confirm the utility on your bill first.

What a Fullerton quote needs to explain

A comparison to ask for

OCPA's terms reward exports more than SCE's do, which can change whether a battery is worth it. Ask each bidder to show the OCPA generation credits and SCE delivery charges separately, with and without a battery, and to say whether its numbers assume OCPA's current NEM 2.0 treatment or the standard Net Billing Tariff.

Verify the company behind the Fullerton quote

Match the business name and license number on each Fullerton proposal to the CSLB record, then use our contractor verification steps, the quote comparison guide and the PPA, loan, lease and cash comparison.

Fullerton solar quote questions